Cycloidal wrench

ABSTRACT

A CYCLOIDAL WRENCH ADAPTED TO ROTATE A DRIVEN ELEMENT IN A GIVEN DIRECTION OR IN THE REVERSE THEREOF, COMPRISING TWO SPACED AND FIXED REACTIVE CAM PLATES AND BETWEEN THEM AN ORBITAL CAM DRIVE PLATE TO WHICH ORBITAL MOTION IS IMPARTED BY AN ECCENTRIC CAM ON A DRIVE SHAFT PROJECTED THROUGH THE REACTIVE CAM PLATES. THE REACTIVE CAM PLATES ARE FORMED WITH TOOTH OR &#34;POINT&#34; FACED APERATURES ALIGNED WITH A POINT FACED APERATURE IN THE ORBITAL CAM DRIVE PLATE. THESE APERATURES ARE ADAPTED TO RECEIVE THE POINT CARRYING HEAD OF THE SAID DRIVEN ELEMENT, AND THE AM PLATES HAVE AT LAST ONE DRIVE POINT MORE THAN THOSE OF THE DRIVEN ELEAT LEAST ONE DRIVE POINT MORE THAN THOSE OF THE DRIVEN ELETHROUGH ENLARGED APERATURE IN THE ORBITAL CAM DRIVE PLATE AND CARRIED BY THE FIXED REACTIVE CAM PLATES, HOLD THE ORBITAL CAM PLATE IS PARALLEL CONSTRAINT WHILE A RELATIONSHIP IS MAINTAINED SUCH THAT THE OPPOSING DRIVE POINTS ON BOTH THE ORBITAL AND REACTIVE CAM PLATES ALIGN WITH THE APICES OF THE DRIGEN ELEMENT.

R. WIECK Nov. 9, 1971 CYCLOIDAL WRENCH Filed July 17, 1970 United States Patent 3,618,430 CYCLOIDAL WRENCH Robert L. Wieck, Amarillo, Tex., assignor to Mason & Hanger-Silas Mason Co. Inc. Filed July 17, 1970, Ser. No. 55,914

Int. Cl. B25b 17/00 US. Cl. 8157.3 3 Claims ABSTRACT OF THE DISCLOSURE A cycloidal wrench adapted to rotate a driven element in a given direction or in the reverse thereof, comprising two spaced and fixed reactive cam plates and between them an orbital cam drive plate to which orbital motion is imparted by an eccentric cam on a drive shaft projected through the reactive cam plates. The reactive cam plates are formed with tooth or point faced apertures aligned with a point faced aperture in the orbital cam drive plate. These apertures are adapted to receive the point carrying head of the said driven element, and the cam plates have at last one drive point more than those of the driven element head. Two or more restraining studs, passing through enlarged aperture in the orbital cam drive plate and carried by the fixed reactive cam plates, hold the orbital cam plate in parallel constraint while a relationship is maintained such that the opposing drive points on both the orbital and reactive cam plates align with the apices of the driven element.

The invention will be described with reference to the accompanying drawings, in which:

FIG. 1 is a longitudinal section through an embodiment of the invention.

FIG. 2 is an enlarged composite view of the primary operational end of the embodiment illustrated in FIG. 1.

FIG. 3 is a perspective view of the embodiment shown in section by FIG. 1.

FIG. 4 is a diagrammatic view to illustrate the calculated relationship of the top and bottom reactive cams and the orbital cam with respect to the driven element.

Referring to the drawings: It will be seen that the embodiment illustrated consists of a bottom reactive cam plate 1, a top reactive cam plate 2, and between them an orbital cam drive plate 3. Tooth or point faced apertures are provided in the embodiment illustrated at one end area of the structure. As to be seen from FIG. 2 of the drawings and diagrammatic view FIG. 4, the cam plates have one more drive point (2*, 3*, FIG. 2), as to each one, than the point-formed head of the element to be driven. Within a round aperture in the orbital cam drive plate 3 is an eccentric cam 5, on stud-shaft 6, the stud-shaft passing through a bearing aperture in the top reactive cam plate 2, and has fixed thereto a maual turn-grip, and the latter can be supplanted by a power device if desired. The turn grip is indicated at 7.

Two or more restraining studs 8 are employed to hold the assembly elements in position, and they pass through enlarged apertures at 9 in the orbital cam plate, receiving at their ends nuts 11. The said studs 8 hold the orbital cam plate in parallel constraint while a relationship is maintained such that the opposing drive points on both the orbital and reactive cam plates align with the apices of the driven element.

"ice

From the above it will be seen that the device is operative to apply a rotary motion, in either direction, to a fastener or other driven element, by imparting an orbital motion to a drive cam having one more tooth, point or facet than the driven element and reacting the driven element against a cam or plural cams as in the embodiment illustrated, with the same geometric constraint as the orbital drive cam, and maintaining a relationship such that the apices of the driven element align with the opposing congruous facets on both the orbital and reactive cam or cams.

It will be understood that various modifications in the form and assembly of the elements comprising the embodiment illustrated may be made within the spirit of the invention. Thus one of the reactive cam plates may be substituted by a plate provided with an opening of sufficient size to permit the point faced area of the driven member to enter the point faced aperture of the reactive cam plate and that of the orbital drive cam plate.

With reference to the calculated relationship of the cams of the reactive cam plates and the orbital cam, in an embodiment of the invention, FIG. 4 may be read with the following table defining the symbols designated on the figure:

NOTE: N designates number of drive points F designates the distance across flats of driven element.

Having described my invention, what I claim and desire to protect by Letters Patent is as follows:

1. A cycloidal wrench adapted to rotate a driven element in a given direction or in reversal thereof, comprising at least one reactive cam plate, an orbital drive plate, an eccentric cam engaging the orbital drive plate and adapted to actuate the same, the reactive and orbital plates being formed with aligned apertures which are point faced and which are adapted to receive a driven element having an exterior point carrying area with a lesser number of points than those of the orbital and reactive plates, and means adapted to hold the orbital drive plate in parallel constraint with a relationship such that the opposing drive points of the orbital and reactive plates align with the apices of such driven element.

2. A cycloidal wrench constructed in accordance with claim 1, embodying two reactive cam plates, with the orbital drive cam plate between them, the means for holding the orbital plate in restraint consisting of at least one restraining stud held by the reactive carn plate means and passing through an enlarged aperture in the orbital plate.

3. A cycloidal wrench in accordance with claim '1, in which the reactive cam plate is associated with a second plate apertured to receive the point carrying area of a driven element, means for holding said two plates so that 3 4 a space is provided between them, the orbital drive plate FOREIGN PATENTS being slidingly held between them. 52 983 10/1928 France 74 804 References Cited JAMES L. JONES, JR., Primary Examiner UNITED STATES PATENTS 5 5 C1 R U. X 2,475,504 7/1949 Jackson 74804 74 8O4 2,170,951 8/1939 Perry 74804 3,270,596 9/1966 Hall et a]. 81-5739 

